1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-22509-4 SANS 831-2:2009 Edition 1 ISO 6242-2:1992 Edition 1SOUTH AFRICAN NATIONAL STANDARD Building construction Expression of users requi
4、rements Part 2: Air purity requirements This national standard is the identical implementation of ISO 6242-2:1992 and is adopted with the permission of the International Organization for Standardization. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001
5、 Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS This standard may only be used and printed by approved subscription and freemailing clients of the SABS. SANS 831-2:2009 Edition 1 ISO 6242-2:1992 Edition 1 Table of changes Change No. Date Scope National foreword This South African stan
6、dard was approved by National Committee SABS TC 59, Construction standards, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in February 2009. This standard may only be used and printed by approved sub
7、scription and freemailing clients of the SABS.INTERNATIONAL STANDARD First edi tian 1992-04-0 1 Building construction - Expression of users requirements - Part 2: Air purity requirements Construction immobili b) in formulating building laws and regulations; c) in drafting Standards and other normati
8、ve docu- ments; and d) more generally when specifying the required Performance of buildings in terms of users re- quirements. Some of the Parameters given in this part of ISO 6242 apply only to certain types of building. Compliance with this part of ISO 6242 does not therefore depend an implementing
9、 the whole of its contents in every case. 2 User b) to prevent the accumulation in indoor air of contaminants detrimental to comfort; c) to provide an adequate supply of Oxygen for oc- cupants and combustion appliances; d) to control nuisance due to odours; and e) to control relative humidity. 2.2 C
10、riteria meeting these objectives shall reflect the following: a) activities to be accommodated; b) age and health of the occupants; c) proportion of Iikely occupants it is intended to satisfy; d) Character and location of combustion appliances dependent on indoor air; e) time during which the requir
11、ements must be satisfied (taking account of climatic extremes and intermittency); and f) any facility for local control of the air purity by the occupants. 3 Parameters for expressing users requirements The purity of air depends on a) for health, the maximum content of noxious sub- stances; b) for c
12、omfort, the maximum concentration of CO, SO, CH4 and other gases. SANS 831-2:2009This standard may only be used and printed by approved subscription and freemailing clients of the SABS.ISO 6242=2:1992(E) These may be interpreted in terms of air supply rate, such as - air changes per hour; functionin
13、g of the air supply and exhaust System. Exceptionally, in certain processes, mixing may not be acceptable and laminar flow Systems may be re- quired. - air supply per person; The requirements for air Change rates shall be re- garded as minima, with no tolerante allowed. - air supply per Square metre
14、 of floor area; 3.2 Expression of air purity Parameters - air supply per combustion appliance. 3.1 Location, uniformity and tolerante for air purity Parameters In all but large spaces, it is normal to assume that the mixing of fresh air with contaminated air will be sufficient to achieve uniform dil
15、ution of contami- nants, but this depends on the correct design and Details of means of expression, together with as- sociated information, are given in table 1. 4 Factors affecting the choice of criteria Details of factors Iikely to affect the choice of criteria for particular applications, togethe
16、r with associated information, are given in table2. SANS 831-2:2009This standard may only be used and printed by approved subscription and freemailing clients of the SABS.ISO 6242=2:1992(E) Parameter Rate of supply of fresh air for occupants Table 1 - Parameters Definition Means of expression: units
17、; Nature of preferred increments criterion Nleans of evaluation Alternatives: 1) Average number of air Air changes/h; Chosen from Minimum Calculation: in accordance changes per hour the series: with national Standards or in tenths from 01 to 0,9; Codes of practice in fifths from 1 upwards Measuremen
18、t: tracer, gas 2) Average volume of air VS per person; Chosen from Minimum techniques supplied to each occupant the series: in units from 1 to 10; then increments of 2 3) Average volume of air I/(sm* ); units Minimum supplied per Square metre of floor area Rate of supply Average volume of air sup- V
19、S per kW of rated input; Minimum Calculation: in accordance of fresh air to plied per unit of rated en- units with national Standards or combustion ap- ergy input to the Codes of practice pliances without combustion appliance NOTE - Different fuels may independent air require different rates of air
20、Measurement: tracer gas =JPPlY supply per kW. techniques Factor Table 2 - Factors affecting criteria Examples of classeslcategories Means of expression Sources of information Activities and Reclining Appropriate rate of fresh air supply, taking into ac- National Standards or tasks for which Sedentar
21、y count density of occupation and the amount of Codes of practice Ventilation is pro- Standing smoke or fumes generated vided Light activity Medium activity Heavy activity Density of occu- pation 2 m*/person 5 m*/ person 10 m*/person The higher the density of occupation, the greater National Standar
22、ds or the air supply needed per person for odour removal Codes of practice Time during which 80 % Where fresh air is supplied solely by natura1 venti- National Standards or requirements 90 % lation, its rate will depend on wind Speed and on Codes of practice must be satisfied 95 Oh internal/external
23、 temperature differente. The fre- quency of these factors will need to be checked from local meteorological records Fuel type Gas Sufficient air must be available to meet the full National Standards or Oil rated input of a combustion appliance at all times, Codes of practice CoaVpeat even though it
24、may operate at a lower rate for part Wood of the time 3 SANS 831-2:2009This standard may only be used and printed by approved subscription and freemailing clients of the SABS.ISO 624202:1992(E) Annex A (informative) Bibliography 1 J ISO 4225:1980, Air quality - General aspects - Vocabulary. S ISO 71
25、62:1992, Performance Standards in building - Confenfs and formaf of sfandards for evaluation of Performance. 2 ISO 4226:1980, Air qualify - General aspecfs - Unifs of measuremenf. 3 ISO 6240:1980, Performance Standards in building - Contents and presenfafion. S ISO 7164-l:-1, Performawe Standards in
26、 building - Part 1: Definitions and means of expression for the Performance of a whole building. 4 ISO 6241:1984, Performance Standards in building - Principles for their preparation and factors to be considered. 7 International Energy Agency: AIC Technical Note 18: A subject analysis of the AICs bi
27、bliographic database - AIRBASE (4th edition, January 1986)*). 1) To be published. 2) Air Infiltration Centre, Bracknell, RG12 4AH, United Kingdom. 4 SANS 831-2:2009 SABSThis standard may only be used and printed by approved subscription and freemailing clients of the SABS. SABS Standards Division Th
28、e objective of the SABS Standards Division is to develop, promote and maintain South African National Standards. This objective is incorporated in the Standards Act, 2008 (Act No. 8 of 2008). Amendments and Revisions South African National Standards are updated by amendment or revision. Users of Sou
29、th African National Standards should ensure that they possess the latest amendments or editions. The SABS continuously strives to improve the quality of its products and services and would therefore be grateful if anyone finding an inaccuracy or ambiguity while using this standard would inform the s
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35、orm or by any means without prior written permission from the SABS Standards Division. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any purpose other than implementation, prior written permission must be obtained. Details and advice can be obtained from the Senior Manager. Tel: +27 (0) 12 428 6666 Fax: +27 (0) 12 428 6928 E-mail: infosabs.co.za This standard may only be used and printed by approved subscription and freemailing clients of the SABS.
